package com.jwell.panrank.tools;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.v4.content.ContextCompat;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;

/**
 * Created by Administrator on 2017/4/20/020.
 */
public class RecyclerViewDivider extends RecyclerView.ItemDecoration {
private Paint mPaint;
private Drawable mDivider;
private int mDividerHeight = 2;//分割线高度，默认为1px
private int mOrientation;//列表的方向：LinearLayoutManager.VERTICAL或LinearLayoutManager.HORIZONTAL
private static final int[] ATTRS = new int[]{android.R.attr.listDivider};

/**
 * 26      * 默认分割线：高度为2px，颜色为灰色
 * 27      *
 * 28      * @param context
 * 29      * @param orientation 列表方向
 * 30
 */
public RecyclerViewDivider(Context context, int orientation) {
        if (orientation != LinearLayoutManager.VERTICAL && orientation != LinearLayoutManager.HORIZONTAL) {
        throw new IllegalArgumentException("请输入正确的参数！");
        }
        mOrientation = orientation;

final TypedArray a = context.obtainStyledAttributes(ATTRS);
        mDivider = a.getDrawable(0);
        a.recycle();
        }

/**
 * 43      * 自定义分割线
 * 44      *
 * 45      * @param context
 * 46      * @param orientation 列表方向
 * 47      * @param drawableId  分割线图片
 * 48
 */
public RecyclerViewDivider(Context context, int orientation, int drawableId) {
        this(context, orientation);
        mDivider = ContextCompat.getDrawable(context, drawableId);
        mDividerHeight = mDivider.getIntrinsicHeight();
        }

/**
 * 56      * 自定义分割线
 * 57      *
 * 58      * @param context
 * 59      * @param orientation   列表方向
 * 60      * @param dividerHeight 分割线高度
 * 61      * @param dividerColor  分割线颜色
 * 62
 */
public RecyclerViewDivider(Context context, int orientation, int dividerHeight, int dividerColor) {
        this(context, orientation);
        mDividerHeight = dividerHeight;
        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mPaint.setColor(dividerColor);
        mPaint.setStyle(Paint.Style.FILL);
        }


//获取分割线尺寸
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        super.getItemOffsets(outRect, view, parent, state);
        outRect.set(0, 0, 0, mDividerHeight);
        }

//绘制分割线
@Override
public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
        super.onDraw(c, parent, state);
        if (mOrientation == LinearLayoutManager.VERTICAL) {
        drawVertical(c, parent);
        } else {
        drawHorizontal(c, parent);
        }
        }

//绘制横向 item 分割线
private void drawHorizontal(Canvas canvas, RecyclerView parent) {
final int left = parent.getPaddingLeft();
final int right = parent.getMeasuredWidth() - parent.getPaddingRight();
final int childSize = parent.getChildCount();
        for (int i = 0; i < childSize; i++) {
final View child = parent.getChildAt(i);
        RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) child.getLayoutParams();
final int top = child.getBottom() + layoutParams.bottomMargin;
final int bottom = top + mDividerHeight;
        if (mDivider != null) {
        mDivider.setBounds(left, top, right, bottom);
        mDivider.draw(canvas);
        }
        if (mPaint != null) {
        canvas.drawRect(left, top, right, bottom, mPaint);
        }
        }
        }

//绘制纵向 item 分割线
private void drawVertical(Canvas canvas, RecyclerView parent) {
final int top = parent.getPaddingTop();
final int bottom = parent.getMeasuredHeight() - parent.getPaddingBottom();
final int childSize = parent.getChildCount();
        for (int i = 0; i < childSize; i++) {
final View child = parent.getChildAt(i);
        RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) child.getLayoutParams();
final int left = child.getRight() + layoutParams.rightMargin;
final int right = left + mDividerHeight;
        if (mDivider != null) {
        mDivider.setBounds(left, top, right, bottom);
        mDivider.draw(canvas);
        }
        if (mPaint != null) {
        canvas.drawRect(left, top, right, bottom, mPaint);
        }
        }
        }

        }
